Extract helper libraries from private repo of telegram-bot.app

monitoring/helpers.go

@@ -0,0 +1,57 @@
+package libpack_monitoring
+
+import (
+	"fmt"
+	"strings"
+
+	libpack_config "github.com/lukaszraczylo/graphql-monitoring-proxy/config"
+)
+
+func (ms *MetricsSetup) get_metrics_name(name string, labels map[string]string) (complete_name string) {
+	if labels == nil {
+		labels = make(map[string]string)
+	}
+	labels["microservice"] = libpack_config.PKG_NAME
+
+	if ms.metrics_prefix != "" {
+		complete_name = ms.metrics_prefix + "_" + name
+	} else {
+		complete_name = name
+	}
+	if labels != nil {
+		complete_name += "{"
+		for k, v := range labels {
+			complete_name += k + "=\"" + v + "\","
+		}
+		complete_name = strings.TrimSuffix(complete_name, ",")
+		complete_name += "}"
+	}
+	return
+}
+
+// validate_metrics_name validates the name of the metric to adhere to the Prometheus naming conventions
+// https://prometheus.io/docs/practices/naming/
+func validate_metrics_name(name string) error {
+	// replace all spaces with underscores and remove all other non-alphanumeric characters
+	name_new := strings.ReplaceAll(name, " ", "_")
+	name_new = strings.Map(func(r rune) rune {
+		if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') || (r >= '0' && r <= '9') || r == '_' {
+			return r
+		}
+		return -1
+	}, name_new)
+	name_new = strings.ReplaceAll(name_new, "__", "_")
+	name_new = strings.Trim(name_new, "_")
+	if name_new != name {
+		return fmt.Errorf("Invalid metric name: %s, expected %s", name, name_new)
+	}
+	return nil
+}
+
+func compile_metrics_with_labels(name string, labels map[string]string) string {
+	metric_name := name
+	for k, v := range labels {
+		metric_name += "_" + k + "_" + v
+	}
+	return metric_name
+}